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  5. GPT-5.3-CodexvsMiMo-V2.6-Flash
Updated Sep 2026

GPT-5.3-CodexvsMiMo-V2.6-Flash

MiMo-V2.6-Flash is cheaper than GPT-5.3-Codex at $0.14/M vs $1.75/M input tokens.

GPT-5.3-Codex and MiMo-V2.6-Flash compared across 10 shared prompts
SpecGPT-5.3-CodexMiMo-V2.6-Flash
Input price$1.75/M tokens$0.14/M tokens
Output price$14/M tokens$0.28/M tokens
Context window400K tokens1.0M tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedFeb 2026Sep 2026
Side by side

Same prompt, both answers

Opening lines from 5 of the 10 prompts both answered. Formatting stripped, words untouched.

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

GPT-5.3-Codex203 words
Recipe: “Weeknight Volcano Pasta” 🌋🍝 A cozy, spicy-savory pasta made from pantry staples in about 25 minutes. Ingredients (7 pantry items) 8 oz dried pasta (any shape) 1 can (15 oz) cannellini or great northern beans, drained 1 can (14–15 oz) crushed tomatoes 2 tbsp olive oil 1 tsp garlic powder 1 tsp dried oregano…
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MiMo-V2.6-Flash199 words
🍯 Golden Honey-Pepper Skillet Pasta A warm, savory-sweet pasta that tastes like comfort in a bowl. 7 Pantry Ingredients: Pasta (spaghetti or penne) Olive oil (or butter) Garlic Honey Soy sauce Red pepper flakes Salt & pepper (counted as one pantry staple) ⏱️ Times Prep Time 5 minutes Cook Time 12 minutes Total ~17…
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

GPT-5.3-Codex470 words
Great goal. Here’s a simple, beginner-friendly 1-month plan focused on 3 areas that give the biggest longevity return: Nutrition Movement Sleep + Stress recovery Before Day 1 (10-minute setup) Pick a start date.
Read the full answer
MiMo-V2.6-Flash939 words
🌱 Your 1-Month Health & Longevity Starter Plan Philosophy: Don't overhaul everything at once. Build one small habit per week, and let them stack. 📌 The 3 Pillars Nourish — Dietary changes Move — Physical activity Restore — Sleep & stress management Week 1: Foundation (Focus: Awareness) 🥗 Nourish Audit your plate…
Read the full answer

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

GPT-5.3-Codex1,360 words
Great prompt. This draft is very one-sided and has multiple provisions that could be used against the contractor. Quick note: I’m not a lawyer, and enforceability depends on jurisdiction. This is practical contract-risk spotting, not legal advice.
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MiMo-V2.6-Flash3,600 words
Analysis of Software Consulting Agreement Overview This agreement is extraordinarily one-sided in favor of Client. Nearly every clause contains provisions that could be exploited against the Contractor. Below is a clause-by-clause analysis with specific suggested modifications.
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Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

GPT-5.3-Codex600 words
For the experienced software engineer Think of an LLM as a very large, probabilistic autocomplete service trained on a massive corpus of text and code. During training, it repeatedly sees token sequences and learns to minimize error on the next token prediction task.
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MiMo-V2.6-Flash1,411 words
How LLMs Learn and Generate Text — Three Audience-Specific Explanations For the Experienced Software Engineer Think of it as an absurdly deep cache with no eviction policy.
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Startup Pitch Teardown

Here's a pitch deck summary for a startup called "MindMeld AI": **Slide 1 - Vision:** "We're building the future of human-AI collaboration.…

GPT-5.3-Codex429 words
Great concept, but three claims stand out as especially weak from an investor diligence perspective: “MindMeld AI reads your brainwaves to predict what you want to type before you think it.” (Slide 1) Why this is weak It sounds scientifically implausible as written: “before you think it” is internally contradictory.
Read the full answer
MiMo-V2.6-Flash1,530 words
The 3 Weakest Claims in the MindMeld AI Pitch Weakness #1: The $180B TAM (Slide 4) Why It's Weak This is the most internally contradictory claim in the entire deck.
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Our Verdict
GPT-5.3-Codex
GPT-5.3-Codex
MiMo-V2.6-Flash
MiMo-V2.6-Flash

Not enough votes to call it. On the specs, nothing separates them.

MiMo-V2.6-Flash costs 50x less per token.

Too close to call
API pricing

Cost per 1M tokens

GPT-5.3-Codex
Input
$1.75
Output
$14.00
MiMo-V2.6-Flash
Input
$0.14
12× cheaper
Output
$0.28
50× cheaper

MiMo-V2.6-Flash is cheaper on both: 12× input, 50× output.

Where to run it

3 hosts

GPT-5.3-Codex2 hosts
HostInOutContextUptime
Azure AI Foundry$1.75 in·$14.00 out·400k·100% upOpenAI$1.75 in·$14.00 out·400k·100% up
MiMo-V2.6-Flash1 host
HostInOutContextUptime
Xiaomifp8$0.14 in·$0.28 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GPT-5.3-Codex is developed by OpenAI while MiMo-V2.6-Flash is developed by Xiaomi. GPT-5.3-Codex has a 400K token context window vs MiMo-V2.6-Flash's 1.0M. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5.3-Codex and MiMo-V2.6-Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

GPT-5.3-Codex costs $1.75/M input tokens and MiMo-V2.6-Flash costs $0.14/M input tokens. MiMo-V2.6-Flash is $1.61/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of GPT-5.3-Codex and MiMo-V2.6-Flash across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

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Same lab, same size, long tail

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MiMo-V2.6-Flash vs MiMo-V2.5Same lab
MiMo-V2.6-Flash logoMercury 2.5 logo
MiMo-V2.6-Flash vs Mercury 2.5Same size
MiMo-V2.6-Flash logoMercury 2.5 Preview logo
MiMo-V2.6-Flash vs Mercury 2.5 PreviewNew provider
MiMo-V2.6-Flash logoMiMo-V2-Flash logo
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GPT-5.3-Codex logoMiMo-V2-Omni logo
GPT-5.3-Codex vs MiMo-V2-OmniCross-provider

Model pages

GPT-5.3-Codex logo
GPT-5.3-Codex53 outputs, specs and price
MiMo-V2.6-Flash logo
MiMo-V2.6-Flash10 outputs, specs and price
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